EC 3-9.

Regulation of the practice of law is accomplished principally by the respective states. Authority to engage in the practice of law conferred in any jurisdiction is not per se a grant of the right to practice elsewhere, and it is improper for a lawyer to engage in practice where he is not permitted by law or by court order to do so. However, the demands of business and the mobility of our society pose distinct problems in the regulation of the practice of law by the states. In furtherance of the public interest, the legal profession should discourage regulation that unreasonably imposes territorial limitations upon the right of a lawyer to handle the legal affairs of his client or upon the opportunity of a client to obtain the services of a lawyer of his choice in all matters including the presentation of a contested matter in a tribunal before which the lawyer is not permanently admitted to practice.